## Trigonometry (10th Edition)

1. Let's consider quadrants and sign of (x,y) coordinates $quadrant (x,y):$ $Quad I$ $(+,+)$ $Quad II$ $(-,+)$ $Quad III$ $(-,-)$ $Quad IV$ $(+,-)$ 2.In Q3 y is negative and x is negative , so $\frac{y}{x}$ is positive